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DESCRIPTION JP2016086358

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DESCRIPTION JP2016086358
Abstract: To provide a technology capable of suppressing cracking of a piezoelectric vibration
element that vibrates a panel. A cover panel 2 is provided on the surface of an electronic device
1. The piezoelectric vibrating element 190 is provided on the inner major surface 20 of the cover
panel 2. The cushioning material 140 for suppressing the breakage of the piezoelectric vibrating
element 190 is provided so as to form a gap between the piezoelectric vibrating element 190 and
the piezoelectric vibrating element 190 between the front side case 3 opposed thereto. There is.
[Selected figure] Figure 3
Electronics
[0001]
The present invention relates to an electronic device.
[0002]
As described in Patent Documents 1 and 2, various techniques have conventionally been
proposed for electronic devices.
[0003]
JP, 2014-57264, A JP, 2003-145048, A
[0004]
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As described in Patent Document 1, a panel provided on the surface of an electronic device may
be vibrated by a piezoelectric vibration element.
In such an electronic device, the piezoelectric vibration element may be broken by an external
impact.
[0005]
Therefore, the present invention has been made in view of the above-described point, and an
object of the present invention is to provide a technology capable of suppressing the breakage of
a piezoelectric vibration element that vibrates a panel.
[0006]
In order to solve the above problems, one aspect of the electronic device according to the present
invention is a panel provided on the surface of the electronic device, a piezoelectric vibration
element provided on the inner main surface of the panel, and the piezoelectric vibration element
And a cushioning material provided between the piezoelectric vibrating element and the
component so as to form a gap between the piezoelectric vibrating element and the piezoelectric
vibrating element, and a cushion material for suppressing cracking of the piezoelectric vibrating
element. Prepare.
[0007]
Further, in one aspect of the electronic device according to the present invention, the size of the
gap is set such that the cushion material does not contact the piezoelectric vibrating element
during vibration.
[0008]
Further, in one aspect of the electronic device according to the present invention, the size of the
gap is a value based on the amplitude of the piezoelectric vibrating element, the variation of the
thickness of the piezoelectric vibrating element, and the variation of the thickness of the
component .
[0009]
Further, in one aspect of the electronic device according to the present invention, when the
piezoelectric vibrating element is flexed by the impact applied to the electronic device and the
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cushioning material hits the piezoelectric vibrating element, the piezoelectric vibrating element
flexes due to the bending. Before the piezoelectric vibration element breaks, the cushion material
hits the piezoelectric vibration element.
[0010]
Further, in one aspect of the electronic device according to the present invention, the component
is a case forming a part of an exterior of the electronic device.
[0011]
According to one aspect of the present invention, the piezoelectric vibration element is less likely
to be broken.
[0012]
It is a front view which shows the external appearance of an electronic device.
It is a back view which shows the external appearance of an electronic device.
It is a figure which shows the cross-section of an electronic device.
It is a figure which shows the cross-section of an electronic device.
It is a figure which shows the electric constitution of an electronic device.
It is a top view which shows the structure of a piezoelectric vibration element.
It is a side view which shows the structure of a piezoelectric vibration element.
It is a figure which shows a mode that a piezoelectric vibration element carries out bending
vibration.
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It is a figure which shows a mode that a piezoelectric vibration element carries out bending
vibration.
It is a figure for demonstrating air conduction sound and conduction sound. It is a figure which
expands and shows the cross-section of an electronic device. It is a figure which expands and
shows the cross-section of an electronic device. It is a figure which expands and shows the crosssection of a 1st comparison object apparatus. It is a figure which expands and shows the crosssection of a 1st comparison object apparatus. It is a figure which expands and shows the crosssection of an electronic device. It is a figure which shows a drop test result.
[0013]
<External Appearance of Electronic Device> FIGS. 1 and 2 are a front view and a rear view
showing the external appearance of the electronic device 1 according to the embodiment,
respectively. FIG. 3 is a schematic view of a cross-sectional structure taken along line A-A of the
electronic device 1 shown in FIG. FIG. 4 is a schematic view of a cross-sectional structure taken
along line B-B of the electronic device 1 shown in FIG. The electronic device 1 according to the
present embodiment is, for example, a mobile phone such as a smartphone.
[0014]
As shown in FIGS. 1 to 4, the electronic device 1 includes a transparent cover panel 2 covering
the display surface 120 a of the display panel 120 (FIG. 3), a front case 3 supporting the cover
panel 2, and a front case And a rear case 4 attached to the rear cover 3. Each of the cover panel
2, the front side case 3 and the rear side case 4 forms a part of the exterior of the electronic
device 1. The back side case 4 is configured of a case main body 40 that accommodates the
battery 200 and that is attached to the front side case, and a cover member 41 that is attached to
the case main body 40 from the back surface 10 side of the electronic device 1. The battery 200
housed in the case main body 40 is covered by a cover member 41. In the present embodiment,
the cover panel 2, the front side case 3 and the rear side case 4 constitute an outer case 5 of the
electronic device 1. The shape of the electronic device 1 is a substantially rectangular plate in a
plan view.
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[0015]
The cover panel 2 constitutes a portion of the front surface portion of the electronic device 1
other than the peripheral end portion (peripheral portion). The front side case 3 and the back
side case 4 constitute a peripheral end portion, a side surface portion and a back surface portion
of the front surface portion of the electronic device 1. Each of the front side case 3 and the rear
side case 4 is made of, for example, a resin and a metal. As the resin, for example, polycarbonate
resin, ABS resin, or nylon resin is adopted, and as the metal, for example, aluminum is adopted. In
a space surrounded by the front side case 3 and the rear side case 4, a printed circuit board (not
shown) on which various components such as a CPU 101 and a DSP 102 described later are
mounted is provided.
[0016]
The cover panel 2 is plate-shaped and has a substantially rectangular shape in a plan view. The
longitudinal direction of the cover panel 2 coincides with the vertical direction of the electronic
device 1. As shown in FIG. 3, the cover panel 2 has an inner first main surface 20 facing the
display surface 120 a of the display panel 120 and an outer second main surface located
opposite to the first main surface 20. And 21. The second major surface 21 constitutes a part of
the front surface of the electronic device 1. Hereinafter, the first major surface 20 may be
referred to as the “inner major surface 20”, and the second major surface 21 may be referred
to as the “outer major surface 21”.
[0017]
The cover panel 2 is made of, for example, acrylic resin, glass or sapphire. Here, sapphire refers
to a single crystal having alumina (Al 2 O 3) as a main component, and in the present
specification, refers to a single crystal having an Al 2 O 3 purity of about 90% or more. The Al 2
O 3 purity is preferably 99% or more from the viewpoints that scratching is less likely to occur
and cracking and chipping can be suppressed more reliably. Other examples of the material of
the cover panel 2 include crystalline materials such as diamond, zirconia, titania, quartz, lithium
tantalate, and aluminum oxynitride. These are also preferably single crystals having a purity of
about 90% or more, from the viewpoint of being more resistant to scratching and more reliably
suppressing cracking and chipping. Moreover, the cover panel 2 may be a composite panel
(laminated panel) having a multi-layer structure. For example, the cover panel 2 is a composite
panel having a two-layer structure including a layer made of sapphire provided on the surface of
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the electronic device 1 and a layer made of glass (glass panel) attached to the layer. It is good. In
addition, the cover panel 2 is attached to a layer made of sapphire (sapphire panel) provided on
the surface of the electronic device 1, a layer made of glass attached to the layer (glass panel),
and the layer It may be a composite panel of a three-layer structure composed of a layer made of
sapphire (sapphire panel).
[0018]
The cover panel 2 is provided with a transparent display portion (also called a display window)
2a through which the display of the display panel 120 is transmitted. The display portion 2a has,
for example, a rectangular shape in plan view. The visible light output from the display panel 120
is extracted to the outside of the electronic device 1 through the display portion 2a. The user can
visually recognize the information displayed on the display panel 120 from the outside of the
electronic device 1 through the display portion 2a.
[0019]
Most of the peripheral edge (peripheral edge) 2 b surrounding the display portion 2 a in the
cover panel 2 is black by, for example, affixing a film or the like. As a result, most of the
peripheral end 2 b is a non-display portion where the display of the display panel 120 does not
transmit.
[0020]
As shown in FIG. 3, a touch panel 130 is attached to the inner major surface 20 of the cover
panel 2. And the display panel 120 which is a display part is stuck on the main surface on the
opposite side to the main surface by the side of the inner main surface 20 in the touch panel
130. That is, the display panel 120 is attached to the inner main surface 20 of the cover panel 2
via the touch panel 130. The display panel 120 is sandwiched between the cover panel 2 and the
front case 3. In the cover panel 2, a portion facing the display panel 120 is a display portion 2a.
The user can give various instructions to the electronic device 1 by operating the display portion
2 a of the cover panel 2 with a finger or the like.
[0021]
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As shown in FIG. 1, a microphone hole 50 is formed at the lower end of the cover panel 2.
Further, as shown in FIG. 2, a speaker hole 80 is formed on the back surface 10 of the electronic
device 1, specifically, on the outer surface of the cover member 41 of the back side case 4.
[0022]
In the exterior case 5, a front side imaging unit 160, a back side imaging unit 170, and a
piezoelectric vibrating element 190, which will be described later, are provided. The piezoelectric
vibrating element 190 is provided on the inner major surface 20 of the cover panel 2 as shown
in FIG. Further, in the outer case 5, a cushion material 140 is provided. The cushion material 140
is disposed between the piezoelectric vibrating element 190 and a component opposed thereto.
In the present embodiment, the cushion material 140 is disposed between the piezoelectric
vibrating element 190 and the front case 3 opposed thereto. The cushion material 140 is
provided on the front case 3 so as not to be in contact with the piezoelectric vibrating element
190. The role of the cushioning material 140 will be described in detail later.
[0023]
A front lens transparent portion 70 is provided at the upper end of the cover panel 2 so that the
imaging lens of the front imaging portion 160 in the outer case 5 can be viewed from the outside
of the electronic device 1. On the back surface 10 of the electronic device 1, a back lens
transparent portion 90 is provided so that the imaging lens of the back surface side imaging unit
170 in the exterior case 5 can be viewed from the outside of the electronic device 1.
[0024]
As shown in FIG. 3, the cover panel 2 is attached to the front case 3 by an attaching member
260. Specifically, the inner main surface 20 of the cover panel 2 is attached to the front case 3
via the attachment member 260. In the present embodiment, the entire periphery of the
peripheral end of the inner main surface 20 of the cover panel 2 is attached to the front case 3
by the attachment member 260. As the sticking member 260, a double-sided tape or an adhesive
is employed.
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[0025]
<Electrical Configuration of Electronic Device> FIG. 5 is a block diagram mainly showing the
electrical configuration of the electronic device 1. As shown in FIG. 5, the electronic device 1 is
provided with a control unit 100, a wireless communication unit 110, a display panel 120, a
touch panel 130, and a piezoelectric vibration element 190. Further, the electronic device 1 is
provided with a microphone 150, a front side imaging unit 160, a back side imaging unit 170, an
external speaker 180, and a battery 200. These components other than the cover panel 2
provided in the electronic device 1 are housed in the outer case 5.
[0026]
The control unit 100 includes a central processing unit (CPU) 101, a digital signal processor
(DSP) 102, a storage unit 103, and the like. The control unit 100 centrally manages the operation
of the electronic device 1 by controlling other components of the electronic device 1.
[0027]
The storage unit 103 is configured of a non-temporary recording medium readable by the
control unit 100 (the CPU 101 and the DSP 102), such as a read only memory (ROM) and a
random access memory (RAM). The storage unit 103 includes a main program and a plurality of
control programs for controlling the respective components such as the wireless communication
unit 110 and the display panel 120 provided in the electronic device 1 for controlling the
electronic device 1. Application programs etc. are stored. Various functions of the control unit
100 are realized by the CPU 101 and the DSP 102 executing various programs in the storage
unit 103.
[0028]
The storage unit 103 may include a non-transitory storage medium readable by a computer,
other than the ROM and the RAM. The storage unit 103 may include, for example, a small hard
disk drive and an SSD (Solid State Drive).
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[0029]
The wireless communication unit 110 has an antenna 111. The wireless communication unit 110
receives a signal from a mobile phone different from the electronic device 1 or a signal from a
communication device such as a web server connected to the Internet via the base station via the
antenna 111. The wireless communication unit 110 performs amplification processing and down
conversion on the received signal, and outputs the result to the control unit 100. The control unit
100 performs demodulation processing and the like on the received signal to be input, and
acquires a sound signal (sound information) indicating sound, music, and the like included in the
received signal.
[0030]
Further, the wireless communication unit 110 performs up-conversion and amplification
processing on the transmission signal including the sound signal and the like generated by the
control unit 100, and wirelessly transmits the processed transmission signal from the antenna
111. A transmission signal from the antenna 111 is received through a base station by a mobile
phone different from the electronic device 1 or a communication device connected to the
Internet.
[0031]
The display panel 120 is, for example, a liquid crystal display panel or an organic EL panel. The
display panel 120 is controlled by the control unit 100 to display various information such as
characters, symbols, and figures. The information displayed on the display panel 120 can be
viewed by the user of the electronic device 1 through the display portion 2 a of the cover panel
2.
[0032]
The touch panel 130 detects an operation on the display portion 2 a of the cover panel 2 by an
operator such as a finger. The touch panel 130 is, for example, a projected capacitive touch
panel. When the user performs an operation on the display portion 2 a with an operator such as
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a finger, an electrical signal corresponding to the operation is input from the touch panel 130 to
the control unit 100. Control unit 100 specifies the content of the operation performed on
display portion 2 a based on the electrical signal from touch panel 130, and performs processing
according to the content.
[0033]
The front side imaging unit 160 is configured of an imaging lens, an imaging element, and the
like. The front side imaging unit 160 captures a still image and a moving image based on the
control of the control unit 100. The imaging lens of the front side imaging unit 160 is visible
from the front lens transparent portion 70 provided on the front of the electronic device 1.
Therefore, the front side imaging unit 160 can pick up an object present on the front side (the
cover panel 2 side) of the electronic device 1.
[0034]
The back side imaging unit 170 is configured of an imaging lens, an imaging element, and the
like. The back side imaging unit 170 captures a still image and a moving image under the control
of the control unit 100. The imaging lens of the back surface side imaging unit 170 is visible
from the back surface lens transparent portion 90 provided on the back surface 10 of the
electronic device 1. Therefore, the back side imaging unit 170 can pick up an object present on
the back side 10 of the electronic device 1.
[0035]
The microphone 150 converts a sound input from the outside of the electronic device 1 into an
electrical sound signal and outputs the signal to the control unit 100. Sound from the outside of
the electronic device 1 is taken into the inside of the electronic device 1 from the microphone
hole 50 provided on the front surface of the cover panel 2 and input to the microphone 150. The
microphone hole 50 may be provided on the side surface of the electronic device 1 or on the
back surface 10.
[0036]
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The external speaker 180 is, for example, a dynamic speaker. The external speaker 180 converts
the electrical sound signal from the control unit 100 into sound and outputs it. The sound output
from the external speaker 180 is output to the outside from the speaker hole 80 provided on the
back surface 10 of the electronic device 1. The sound output from the speaker hole 80 is loud
enough to be heard even at a place away from the electronic device 1.
[0037]
The piezoelectric vibrating element 190 is provided on the inner major surface 20 of the cover
panel 2 provided on the front surface of the electronic device 1 as described above. The
piezoelectric vibrating element 190 is vibrated by the drive voltage supplied from the control
unit 100. The control unit 100 generates a drive voltage based on the sound signal, and applies
the drive voltage to the piezoelectric vibration element 190. The piezoelectric vibration element
190 is vibrated by the control unit 100 based on the sound signal, whereby the cover panel 2
vibrates based on the sound signal. As a result, the reception sound is transmitted from the cover
panel 2 to the user. The volume of the reception sound is such that the user can appropriately
hear when the user brings his ear close to the cover panel 2. The reception sound transmitted to
the user from the cover panel 2 will be described in detail later.
[0038]
The battery 200 outputs the power of the electronic device 1. The power source output from the
battery 200 is supplied to each electronic component included in the control unit 100, the
wireless communication unit 110, and the like included in the electronic device 1.
[0039]
<Details of Piezoelectric Vibrating Element> FIGS. 6 and 7 are a top view and a side view showing
the structure of the piezoelectric vibrating element 190, respectively. As shown in FIGS. 6 and 7,
the piezoelectric vibrating element 190 has an elongated shape in one direction. Specifically, the
piezoelectric vibrating element 190 has a rectangular elongated plate shape in a plan view. The
piezoelectric vibrating element 190 has, for example, a bimorph structure. The piezoelectric
vibrating element 190 includes a first piezoelectric ceramic plate 190a and a second
piezoelectric ceramic plate 190b which are bonded to each other via a shim member 190c.
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[0040]
In the piezoelectric vibrating element 190, when a positive voltage is applied to the first
piezoelectric ceramic plate 190a and a negative voltage is applied to the second piezoelectric
ceramic plate 190b, the first piezoelectric ceramic plate 190a extends in the longitudinal
direction. As a result, the second piezoelectric ceramic plate 190b shrinks along the longitudinal
direction. As a result, as shown in FIG. 8, the piezoelectric vibrating element 190 is bent in a
mountain shape with the first piezoelectric ceramic plate 190 a being outside.
[0041]
On the other hand, in the piezoelectric vibrating element 190, when a negative voltage is applied
to the first piezoelectric ceramic plate 190a and a positive voltage is applied to the second
piezoelectric ceramic plate 190b, the first piezoelectric ceramic plate 190a is in the longitudinal
direction The second piezoelectric ceramic plate 190b extends along the longitudinal direction.
As a result, as shown in FIG. 9, the piezoelectric vibrating element 190 is bent in a mountain
shape with the second piezoelectric ceramic plate 190b outside.
[0042]
The piezoelectric vibrating element 190 performs flexural vibration along the longitudinal
direction by alternately taking the state of FIG. 8 and the state of FIG. The control unit 100
applies an alternating voltage in which a positive voltage and a negative voltage alternately
appear between the first piezoelectric ceramic plate 190a and the second piezoelectric ceramic
plate 190b, thereby to elongate the piezoelectric vibrating element 190 in the longitudinal
direction. Sway and vibrate along.
[0043]
The piezoelectric vibrating element 190 having such a structure is disposed at the peripheral end
of the inner major surface 20 of the cover panel 2. Specifically, the piezoelectric vibrating
element 190 is disposed at the central portion in the short side direction of the cover panel 2
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(the left-right direction of the electronic device 1) at the upper end of the inner major surface 20
of the cover panel 2. Further, the piezoelectric vibrating element 190 is disposed such that its
longitudinal direction is along the short direction of the cover panel 2. Thereby, the piezoelectric
vibration element 190 performs bending vibration along the short side direction of the cover
panel 2. The center of the piezoelectric vibrating element 190 in the longitudinal direction
coincides with the center of the cover panel 2 in the lateral direction at the upper end of the
inner major surface 20 of the cover panel 2.
[0044]
Here, as shown in FIGS. 8 and 9 described above, in the piezoelectric vibration element 190 that
performs flexural vibration, the displacement amount is largest at the center in the longitudinal
direction. Therefore, when the center in the longitudinal direction of the piezoelectric vibrating
element 190 coincides with the center in the short direction at the upper end of the inner major
surface 20 of the cover panel 2, the displacement amount of the piezoelectric vibrating element
190 in bending vibration The location of the maximum is to coincide with the center in the short
direction at the upper end of the inner major surface 20 of the cover panel 2.
[0045]
In the piezoelectric vibrating element 190 shown in FIGS. 6 to 9, only one structure including the
first piezoelectric ceramic plate 190a and the second piezoelectric ceramic plate 190b bonded to
each other with the shim member 190c interposed therebetween is provided. However, multiple
such structures may be stacked. In this case, the number of layers of the laminated structure of
the piezoelectric vibration element 190 is preferably 28 or more, and more preferably 44 or
more. Thereby, sufficient vibration can be transmitted to the cover panel 2.
[0046]
In addition to the piezoelectric ceramic material, the piezoelectric vibration element 190 may be
made of an organic piezoelectric material such as polyvinylidene fluoride or polylactic acid.
Specifically, for example, the piezoelectric vibrating element 190 may be configured of first and
second piezoelectric plates made of polylactic acid films laminated to each other. As an electrode
provided on the piezoelectric plate, for example, a transparent electrode such as ITO (Indium-TinOxide, ie, indium tin oxide) can be used.
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[0047]
Regarding Generation of Receiving Sound In the electronic device 1 according to the present
embodiment, air conduction sound and conducted sound are transmitted to the user from the
cover panel 2 by the piezoelectric vibration element 190 vibrating the cover panel 2 . In other
words, when the vibration of the piezoelectric vibrating element 190 itself is transmitted to the
cover panel 2, the air conduction sound and the conduction sound are transmitted from the cover
panel 2 to the user.
[0048]
Here, the air conduction sound is a sound that is recognized by the human brain when a sound
wave (air vibration) that has entered the ear canal hole (so-called "ear hole") vibrates the
tympanic membrane. On the other hand, the conduction sound is a sound that is recognized by
the human brain when the auricle is vibrated and the vibration of the auricle is transmitted to the
tympanic membrane to vibrate the tympanic membrane. The air conduction sound and the
conduction sound will be described in detail below.
[0049]
FIG. 10 is a figure for demonstrating air conduction sound and conduction sound. The structure
of the ear of the user of the electronic device 1 is shown in FIG. In FIG. 10, a broken line 400
indicates the conduction path of the sound signal (sound information) when the air conduction
sound is recognized by the brain. The solid line 410 shows the conduction path of the sound
signal when the conduction sound is recognized in the brain.
[0050]
When the piezoelectric vibrating element 190 attached to the cover panel 2 is vibrated based on
an electrical sound signal indicating a reception sound, the cover panel 2 vibrates and a sound
wave is output from the cover panel 2. When the user holds the electronic device 1 and brings
the cover panel 2 of the electronic device 1 close to the pinnae 300 of the user, or the cover
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panel 2 of the electronic device 1 is in the pinnae 300 of the user. Sound waves emitted from the
cover panel 2 enter the ear canal hole 310. The sound wave from the cover panel 2 travels in the
ear canal 310 and vibrates the tympanic membrane 320. The vibration of the tympanic
membrane 320 is transmitted to the ossicle 330, and the ossicle 330 vibrates. Then, the
vibration of the earlobe 330 is transmitted to the cochlea 340 and converted to an electrical
signal in the cochlea 340. This electrical signal is transmitted to the brain through the auditory
nerve 350, and the received sound is recognized in the brain. Thus, the air conduction sound is
transmitted from the cover panel 2 to the user.
[0051]
Further, when the user holds the electronic device 1 in hand and applies the cover panel 2 of the
electronic device 1 to the pinnae 300 of the user, the pinnae 300 is vibrated by the piezoelectric
vibrating element 190 It is vibrated by the cover panel 2. The vibration of the pinna 300 is
transmitted to the tympanic membrane 320, and the tympanic membrane 320 vibrates. The
vibration of the tympanic membrane 320 is transmitted to the ossicle 330, and the ossicle 330
vibrates. Then, the vibration of the earlobe 330 is transmitted to the cochlea 340 and converted
into an electrical signal in the cochlea 340. This electrical signal is transmitted to the brain
through the auditory nerve 350, and the received sound is recognized in the brain. Thus, the
conductive sound is transmitted from the cover panel 2 to the user. In FIG. 10, the auricular
cartilage 300a inside the auricle 300 is also shown.
[0052]
The bone conduction sound is a sound recognized by the human brain by vibrating the skull and
the vibration of the skull directly stimulates the inner ear such as the cochlea. In FIG. 10, for
example, when the mandible 500 is vibrated, transmission paths of sound signals when bone
conduction sound is recognized by the brain are indicated by a plurality of arcs 420.
[0053]
Thus, in the present embodiment, air conduction sound and conducted sound are transmitted
from the cover panel 2 to the user of the electronic device 1 by the piezoelectric vibration
element 190 vibrating the cover panel 2 on the front surface appropriately. Can. The user can
hear the air conduction sound from the cover panel 2 by bringing the ear (ear) into close
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proximity to the cover panel 2. Also, the user can hear the air conduction sound and the
conduction sound from the cover panel 2 by bringing the ear (ear) into contact with the cover
panel 2. The structure of the piezoelectric vibrating element 190 according to the present
embodiment is devised so as to appropriately transmit the air conduction sound and the
conduction sound to the user. By configuring the electronic device 1 so as to transmit air
conduction noise and conduction noise to the user, various advantages occur.
[0054]
For example, since the user can hear the sound by placing the cover panel 2 on his / her ear, the
user can make a call without being concerned about the position at which he / she places his /
her ear on the electronic device 1.
[0055]
In addition, when the ambient noise is large, the user can make it difficult to hear the ambient
noise while pressing the ear against the cover panel 2 to increase the volume of the conducted
sound.
Therefore, the user can appropriately make a call even when the surrounding noise is loud.
[0056]
In addition, even when the user attaches the earplug or the earphone to the ear, the user can
recognize the reception sound from the electronic device 1 by applying the cover panel 2 to the
ear (more specifically, the pinnae). Can. In addition, even when the user attaches a headphone to
his / her ear, the user can recognize a received sound from the electronic device 1 by placing the
cover panel 2 on the headphone.
[0057]
A portion of the cover panel 2 to which the piezoelectric vibrating element 190 is attached is
relatively easy to vibrate. Therefore, the user brings the ear closer to the upper end (in particular,
the center of the upper end in the short direction DR2) of the cover panel 2 to which the
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piezoelectric vibrating element 190 is attached. If so, the sound from the cover panel 2 can be
easily heard.
[0058]
<Cushion Material> FIG. 11 is an enlarged view showing the vicinity of the piezoelectric vibration
element 190 and the cushion material 140 in the sectional structure shown in FIG. FIG. 12 is an
enlarged view of the vicinity of the piezoelectric vibrating element 190 and the cushion material
140 in the cross-sectional structure shown in FIG.
[0059]
As shown in FIGS. 11 and 12, the piezoelectric vibrating element 190 is attached to the inner
major surface 20 of the cover panel 2 by an attaching member 270. Further, the cushioning
material 140 is attached to the main surface 30 on the cover panel 2 side of the front side case 3
by an attaching member 280. For example, a foam is employed as the cushion material 140. As
the said foam, a urethane foam, a polyolefin-type foam, or a polyester-type foam is used, for
example. Each of the sticking members 270 and 280 is, for example, a double-sided tape or an
adhesive.
[0060]
When the touch panel 130 extends to the upper end portion of the cover panel 2, the
piezoelectric vibrating element 190 may be provided on the inner main surface 20 of the cover
panel 2 via the touch panel 130.
[0061]
The cushion material 140 is a member that suppresses the piezoelectric vibrating element 190
from being broken when an impact is applied to the electronic device 1 due to the falling of the
electronic device 1 or the like.
The cushion material 140 is provided between the piezoelectric vibration element 190 and the
front case 3 so that a gap 290 is formed between the cushion material 140 and the piezoelectric
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vibration element 190. The piezoelectric vibrating element 190 and the cushion material 140 are
opposed to each other. The thickness t1 of the piezoelectric vibrating element 190 is, for
example, larger than the thickness t2 of the cushion material 140. The thickness t2 of the
cushion material 140 is set to, for example, 0.3 mm.
[0062]
In the present embodiment, the size (length) d of the gap 290 between the piezoelectric vibrating
element 190 and the cushion material 140 is the piezoelectric vibrating element 190 (the
piezoelectric vibrating element during vibration) being vibrated by the control unit 100. It is set
so that the cushioning material 140 does not contact 190).
[0063]
Further, the size d of the gap 290 is a value based on the amplitude of the piezoelectric vibration
element 190, the variation of the thickness t1 of the piezoelectric vibration element 190, and the
variation of the thickness t3 of the front side case.
For example, in the present embodiment, the amplitude of the piezoelectric vibrating element
190 is about 0.2 mm, and the sum of the maximum value of the variation of the thickness t1 of
the piezoelectric vibrating element 190 and the maximum value of the variation of the thickness
t3 of the front side case (Hereinafter, it is called "variation maximum value") is about 0.1 mm.
Further, in the present embodiment, the sum of the amplitude of the piezoelectric vibration
element 190 and the maximum value of the variation is less than 0.3 mm. In such a case, the
design value of the size d of the gap 290 is set to a value slightly larger than the sum of the
amplitude of the piezoelectric vibrating element 190 and the variation maximum value, for
example, 0.3 mm. As a result, even if the thickness of the piezoelectric vibration element 190 and
the thickness of the front case 3 vary, the cushion material 140 can be prevented from
contacting the piezoelectric vibration element 190 during vibration. Therefore, it is suppressed
that the vibration of the piezoelectric vibration element 190 is inhibited by the cushion material
140, and it is possible to suppress the difficulty in transmitting sound from the electronic device
1 to the user.
[0064]
As described above, in the present embodiment, since the cushion material 140 is provided
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between the piezoelectric vibrating element 190 and the front case 3, an impact is applied to the
electronic device 1 due to the falling of the electronic device 1 or the like. In this case, it is
possible to suppress the piezoelectric vibrating element 190 from being broken. This point will
be described in detail below.
[0065]
FIG. 13 is a diagram schematically showing the cross-sectional structure of the electronic device
1 (hereinafter, referred to as “first comparison target device”) in which the cushion material
140 is not provided. The cross-sectional structure shown in FIG. 13 corresponds to the crosssectional structure shown in FIG. In the first comparison target device, the distance between the
piezoelectric vibrating element 190 and the front case 3 is set to, for example, 0.3 mm.
[0066]
FIG. 14 is a view schematically showing the cross-sectional structure of the first comparison
target device when the first comparison target device falls on a floor or the like and an impact is
applied to the first comparison target device. When the first comparison target device falls on a
floor or the like and an impact is applied to the first comparison target device, the front side case
3 may hit the piezoelectric vibrating element 190, as shown in FIG. is there. As a result, the
piezoelectric vibration element 190 may be broken. In the example of FIG. 14, although both the
cover panel 2 and the front side case 3 are bent by an impact applied to the first comparison
target device, only one of the cover panel 2 and the front side case 3 is bent. The front case 3
may hit the piezoelectric vibrating element 190.
[0067]
As described above, in the first comparison target device in which the cushion member 140 is
not provided, the front side case 3 hits the piezoelectric vibration element 190 by the impact
applied to the first comparison target device, and the piezoelectric vibration element 190 is
broken. Sometimes.
[0068]
Therefore, it is conceivable to make the piezoelectric vibrating element 190 less likely to hit the
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front side case 3 by increasing the distance between the piezoelectric vibrating element 190 and
the front case 3.
For example, an electronic device 1 in which the distance between the piezoelectric vibrating
element 190 and the front case 3 is set to 0.6 mm (hereinafter, referred to as “second
comparison target device”) can be considered.
[0069]
However, even in the second comparison target device, when a strong impact is applied thereto,
the front side case 3 may hit the piezoelectric vibrating element 190 and the piezoelectric
vibrating element 190 may be broken.
[0070]
Further, it is also possible to prevent the piezoelectric vibrating element 190 from contacting the
front side case 3 by preventing the front side case 3 from facing the piezoelectric vibrating
element 190.
In this case, it is possible to prevent the piezoelectric vibrating element 190 from being broken
when the front side case 3 hits the piezoelectric vibrating element 190. However, even in the
electronic device 1 in which the front case 3 does not face the piezoelectric vibrating element
190 (hereinafter, referred to as “third comparison target device”), the piezoelectric vibrating
element 190 is released when an impact is applied to the electronic device 1. May break.
Specifically, the cover panel 2 may be bent by an impact applied to the third comparison target
device, and as a result, the piezoelectric vibration element 190 may be largely bent. At this time,
the piezoelectric vibration element 190 may break due to its own deflection.
[0071]
On the other hand, in the electronic device 1 according to the present embodiment, since the
cushioning material 140 is provided between the piezoelectric vibrating element 190 and the
front side case 3, the front side case 3 contacts the piezoelectric vibrating element 190. As a
result, the piezoelectric vibration element 190 can be suppressed from being broken.
[0072]
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Furthermore, since the cushion material 140 is provided between the piezoelectric vibration
element 190 and the front case 3 so that a gap 290 is formed between the cushion material 140
and the piezoelectric vibration element 190, the cushion material 140 is a piezoelectric vibration
element It is possible to suppress inhibition of the vibration of 190.
[0073]
Further, in the electronic device 1 according to the present embodiment, as described above, the
amplitude of the piezoelectric vibrating element 190, the variation in the thickness t1 of the
piezoelectric vibrating element 190, and the variation in the thickness t3 of the front case are
considered. The design value of the size d of the gap 290 is set to 0.3 mm.
Thereby, when the piezoelectric vibrating element 190 is flexed and the cushioning material 140
is in contact with the piezoelectric vibrating element 190 as shown in FIG. 15 by an impact
applied to the electronic device 1, the bending of the piezoelectric vibrating element 190 is
caused. The cushion material 140 is in contact with the piezoelectric vibrating element 190
before the piezoelectric vibrating element 190 is broken.
That is, before the piezoelectric vibration element 190 is broken due to the bending of the
piezoelectric vibration element 190, the cushion material 140 suppresses the bending of the
piezoelectric vibration element 190. Therefore, unlike the third comparison target device, the
cushioning material 140 can prevent the piezoelectric vibrating element 190 from being
excessively bent by an impact applied to the electronic device 1. As a result, the impact applied to
the electronic device 1 can further suppress the piezoelectric vibrating element 190 from being
broken.
[0074]
FIG. 16 is a diagram showing the results of a drop test performed on each of the first comparison
target device, the second comparison target device, the third comparison target device, and the
electronic device 1 according to the present embodiment. . In FIG. 16, “o” indicates that the
piezoelectric vibrating element 190 was not broken by the drop test, and “x” indicates that the
piezoelectric vibrating element 190 was broken by the drop test. FIG. 16 shows the results when
the device to be tested falls from each of the heights of 100 cm, 150 cm and 200 cm onto the
drop test plate.
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[0075]
In the drop test, at each height, the device to be tested is dropped 18 times onto the drop test
plate. Specifically, the device to be tested is dropped three times with its front surface (the
surface on the cover panel 2 side) facing the drop test plate side (downward), and its back
surface (the cover member 41 side) Face down to the drop test plate side and dropped three
times. Furthermore, the device to be tested is dropped three times with its upper side facing the
drop test plate side and dropped three times with its lower side facing the drop test plate side.
Then, the device to be tested is dropped three times so that the right side surface faces the drop
test plate side, and dropped three times such that the left side surface faces the drop test plate
side. In this way, after the device to be tested is dropped onto the drop test plate 18 times, if the
piezoelectric vibrating element 190 is cracked, it will be “x”, and if it is not cracked, it will be
“o”. The drop test plate used in the drop test is a plate having a length of 400 mm, a width of
400 mm, and a thickness of 25 mm, and is made of carbon steel called S50C. In addition, the
surface of the drop test plate is unichrome plated.
[0076]
As shown in FIG. 16, in the first comparison target device in which there is no cushion material
140 and the distance between the piezoelectric vibrating element 190 and the front side case 3
is set to 0.3 mm, it was dropped from a height of 100 cm. In this case, although the piezoelectric
vibrating element 190 does not break, the piezoelectric vibrating element 190 will break if
dropped from a height of 150 cm and 200 cm.
[0077]
Further, in the second comparison target device in which the cushion material 140 is not
provided and the distance between the piezoelectric vibrating element 190 and the front side
case 3 is set to 0.6 mm, when dropped from heights of 100 cm and 150 cm, Although the
piezoelectric vibration element 190 does not break, when it is dropped from a height of 200 cm,
the piezoelectric vibration element 190 is broken.
Similarly, in the third comparison target device in which the cushioning material 140 is not
present and the piezoelectric vibrating element 190 does not face the front side case 3, the
piezoelectric vibrating element 190 Although it is not broken, when it is dropped from a height
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of 200 cm, the piezoelectric vibration element 190 is broken.
[0078]
On the other hand, in the electronic device 1 according to the present embodiment, the
piezoelectric vibrating element 190 does not break even when dropped from a height of 200 cm.
Therefore, it can be said from the drop test result shown in FIG. 16 that the piezoelectric
vibrating element 190 is very hard to be broken in the electronic device 1 according to the
present embodiment.
[0079]
In the above example, the component facing the piezoelectric vibrating element 190 is the front
case 3 but may be another component. For example, the component facing the piezoelectric
vibrating element 190 may be an electronic component or the like provided on the front case 3.
[0080]
In the above example, although the present invention is applied to a portable telephone as an
example, the present invention can be applied to other electronic devices. For example, the
present invention can be applied to a tablet terminal, a wearable type electronic device attached
to an arm, and the like.
[0081]
As mentioned above, although the electronic device 1 was demonstrated in detail, the abovementioned description is an illustration in all the aspects, Comprising: This invention is not
limited to it. Further, the various modifications described above can be combined and applied as
long as no contradiction arises. And, it is understood that innumerable modifications not
illustrated may be assumed without departing from the scope of the present invention.
[0082]
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REFERENCE SIGNS LIST 1 electronic device 2 cover panel 3 front side case 140 cushion material
190 piezoelectric vibration element
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